| Matteo Scandolo | f9d4341 | 2021-01-12 11:11:34 -0800 | [diff] [blame^] | 1 | // Copyright 2019 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build aix darwin freebsd linux netbsd openbsd solaris |
| 6 | |
| 7 | package unix |
| 8 | |
| 9 | import ( |
| 10 | "runtime" |
| 11 | ) |
| 12 | |
| 13 | // Round the length of a raw sockaddr up to align it properly. |
| 14 | func cmsgAlignOf(salen int) int { |
| 15 | salign := SizeofPtr |
| 16 | |
| 17 | // dragonfly needs to check ABI version at runtime, see cmsgAlignOf in |
| 18 | // sockcmsg_dragonfly.go |
| 19 | switch runtime.GOOS { |
| 20 | case "aix": |
| 21 | // There is no alignment on AIX. |
| 22 | salign = 1 |
| 23 | case "darwin", "illumos", "solaris": |
| 24 | // NOTE: It seems like 64-bit Darwin, Illumos and Solaris |
| 25 | // kernels still require 32-bit aligned access to network |
| 26 | // subsystem. |
| 27 | if SizeofPtr == 8 { |
| 28 | salign = 4 |
| 29 | } |
| 30 | case "netbsd", "openbsd": |
| 31 | // NetBSD and OpenBSD armv7 require 64-bit alignment. |
| 32 | if runtime.GOARCH == "arm" { |
| 33 | salign = 8 |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | return (salen + salign - 1) & ^(salign - 1) |
| 38 | } |